21760461 has 32 divisors (see below), whose sum is σ = 34206720. Its totient is φ = 13642992.

The previous prime is 21760399. The next prime is 21760489. The reversal of 21760461 is 16406712.

It is not a de Polignac number, because 21760461 - 2⁶ = 21760397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21760261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41346 + ... + 41868.

It is an arithmetic number, because the mean of its divisors is an integer number (1068960).

Almost surely, 2^21760461 is an apocalyptic number.

It is an amenable number.

21760461 is a deficient number, since it is larger than the sum of its proper divisors (12446259).

21760461 is a wasteful number, since it uses less digits than its factorization.

21760461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21760461 is about 4664.8109286444. The cubic root of 21760461 is about 279.1832534092.

The spelling of 21760461 in words is "twenty-one million, seven hundred sixty thousand, four hundred sixty-one".